Ultrasonic humidifier



FIG. 1 is a front elevational view of an ultrasonic humidifier showing our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and

FIG. 7 is a top and front perspective view thereof.

The broken line showing of elements visible on the control panel is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an ultrasonic humidifier, as shown and described. 